Heat treatment of concentrated milk protein system affect viscosity and enzymatic coagulation properties - Institut Agro Rennes-Angers Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Heat treatment of concentrated milk protein system affect viscosity and enzymatic coagulation properties

Résumé

Dairy ingredients with highly concentrated protein contents are high added value products with expanding market. They are known to have specific properties adapted for a multitude of applications (cheese, bakery, infant formulae, nutritional products for the elderly and sportspeople...). Fabrication of such dairy protein ingredients is conducted by a succession of unit operations where heat treatment is a key step that induces major changes in protein structures and thus ingredients functionalities. However, due to an incomplete understanding of phenomena taking place at these high protein concentrations, shedding light on these mechanisms is simultaneously a scientific challenge and an industrial need. For this purpose, we used an original approach to investigate the influence of heat treatment and mineral environment of concentrated milk protein system on viscosity and enzymatic coagulation properties. Experiments were conducted with fresh whey protein isolates (WPI) and native phosphocaseinates (NPC) according to the ratio 20:80 (WPI:NPC) using 4 different technological routes: without heat treatment (Control); with one heat treatment at 10% w/w protein; with one heat treatment at 20% w/w protein and with two heat treatments at 10% and 20% w/w protein. Interestingly, the protein concentration of the heat-treated solution greatly modulates the denaturation and aggregation process of whey proteins, which modifies the association mechanisms between WPI and NPC. Indeed, the increase of protein content leads to a higher particles collision probability and a shorter inter-protein distance modifying protein-protein interactions. Furthermore, the nature of complexes formed during the heat treatment and the amount of aggregates present in solution are two parameters that can modulate the rheological properties (here viscosity and enzymatic coagulation ie, gel time and gel strength) of the system. Influence of lactose and mineral environment is discussed in a second time.
Fichier principal
Vignette du fichier
AERC 2022 Seville François Martin INRAE STLO.pdf (1.6 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03657419 , version 1 (03-05-2022)

Licence

Paternité - Pas d'utilisation commerciale - Pas de modification

Identifiants

  • HAL Id : hal-03657419 , version 1

Citer

François Martin, Luisa Azevedo-Scudeller, Arnaud Paul, Gaëlle Tanguy, Emeline Gousse, et al.. Heat treatment of concentrated milk protein system affect viscosity and enzymatic coagulation properties. Annual European Rheology Conference (AERC 2022), Apr 2022, Séville, Spain. ⟨hal-03657419⟩
58 Consultations
47 Téléchargements

Partager

Gmail Facebook X LinkedIn More